交流变换系统中的电压复合技术研究+文献综述.docVIP

交流变换系统中的电压复合技术研究+文献综述 摘要控制交流电压往往涉及改变幅度、相位和电压的谐波分量，这需要在电压过 零点处及附近添加交流电压。额外电压的复合，通常需要交流或者直流源，采用 脉冲宽度调制技术实现。本文运用了一种新型的电压复合控制技术，利用最简单 的交流斩波器拓扑，采用双虚拟正交电压源来合成所需的电压。此种电压复合控 制技术，采用较少的元器件，不需要多余的电压源或储能元件，便可实现相移及 谐波分量控制。这种控制技术，可以应用于简单而有潜力的产品开发中，比如可 控变压器和逆变器的有源滤波器等。5154 关键词脉宽调制技术 交流斩波器 电压复合 滤波器 TitleVoltage Synthesis in AC Power Conversion Abstract Controlling an ac voltage often involves changing the amplitude ,Phase, and harmonic content of the voltage. This can require theadditionOf voltage at or around the zero crossing of the available ac voltage. Synthesis of this addition voltage normally requires an ac or dc source from which the desired voltage can be synthesized using pulsewidth mod- ulation techniques. Thispaper proposes a novel concept wherein dual vir- tual quadrature sources are used to synthesize the required additional voltage. This is seen to result in simple low-cost ac converters that are robust, have minimal component count ,and can realize phase shift and harmonic control without requiring multiple sources or energy-storage elements. The approach is seen to have simple implementation and can re- alize potentially useful devices such ac controllable transformers and inverter-less active filters. KeywordsPulsewidth modulation techniques(PWM), AC buck chopper ,Voltage 4.2.1PWM信号的产生..............................................20 4.2.2滤波器的设计................................................22 4.2.3基于Matlab 的仿真图.........................................23 4.2.4仿真波形分析................................................24 4．3交流斩波器的新型电压复合技术闭环控制.........................26 4.3.1控制策略....................................................26 4.3.2仿真与结果分析..............................................27 5系统软硬件可行性分析............................................33 5．1系统硬件设计方案.............................................33 5．2系统软件设计方案.............................................34 结论...............................................................36 致谢..........................